Allow to have more chains in linked_list-test
Allow to have more chains in linked_list-test

LinkedListTest is one of our most used tests for correcness, but
it has a small maximum number of chains (256) which means that batches
are also accordingly small. This raises that limit to 65536 so that we
can make these tests submit larger batches.

Change-Id: Ideda1bfd130377792528d8bede1e7c44b4cf938f
Reviewed-on: http://gerrit.cloudera.org:8080/2125
Tested-by: Kudu Jenkins
Reviewed-by: Todd Lipcon <2c763d726a8c2f6afda9be7e0e56a2caa6bb5e6b@apache.org>

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